Peanut Butter Bratwurst
When you are engaging in anal sex while your partner has to take a shit, and it gets shoved deeper into their rectum until it will no longer remain inside them, and it splashes out.
"Bro, what the hell was that? We were engaging in some hot anal sex! What's with all the shit?"
"Sorry bro. Didn't mean to give you a Peanut Butter Bratwurst."
"Sorry bro. Didn't mean to give you a Peanut Butter Bratwurst."